public int EndRead(IAsyncResult itfAR)
{
if (itfAR == null)
{
throw new ArgumentNullException("AsyncResult cannot be null");
}
if (!(itfAR is CanAsyncResult))
{
throw new ArgumentException("AsyncResult object was not created by calling BeginRead on this class.");
}
CanAsyncResult result = (CanAsyncResult)itfAR;
try
{
if (!result.IsCompleted)
{
result.AsyncWaitHandle.WaitOne();
}
if (result.Error != null)
{
throw new USBException("Asynchronous read from pipe has failed.", result.Error);
}
return(result.MessageTransfered);
}
finally
{
result.Dispose();
}
}
/// <summary>
/// Opens a new CAN bus connection.
/// </summary>
public void Open()
{
LasException = null;
if (!IsConnected)
{
throw new CanAdapterException("Adapter is Disconnected. Code:-8604."); //Doc
}
if (!_isOpen)
{
IncomingMsgQueue = new SafeQueue <CanMessage>();
OutgoingMsgQueue = new SafeQueue <CanMessage>();
_isOpen = true;
isAbort = false;
_asyncReadBeginResult = null;
Services.Start();
if (Attributes.State != CanState.SDEV_START)
{
throw new CanAdapterException("Unable to open the bus. Code:-8607."); //Doc
}
Usb.Pipes[USB_MSG_IN_ADDR].Flush();
_asynReadCpltCallback = new AsyncCallback(MsgPipeReadComplate);
_asyncReadResult = Usb.Pipes[USB_MSG_IN_ADDR].BeginRead(rxMsgPacketBuffer, 0, UsbMsgInEpSize, _asynReadCpltCallback, Usb);
}
else
{
throw new CanAdapterException("The bus is already opened. Code:-8608."); //Doc
}
}
public IAsyncResult BeginRead(CanMessage[] frames, int offset, int length, AsyncCallback userCallback, object stateObject)
{
if (!IsConnected)
{
throw new CanAdapterException("Adapter is Disconnected. Code:-8604."); //Doc
}
if (!_isOpen)
{
throw new CanAdapterException("Bus is Closed. Code:-8605"); //Doc
}
if (frames == null)
{
throw new ArgumentNullException("Frame Buffer cannot be null. Code:-8606."); //Doc
}
_readBeginFrameArray = frames;
_readBeginLength = length;
_readBeginOffset = offset;
_asyncReadBeginResult = new CanAsyncResult(userCallback, stateObject);
try
{
//Van annyi elem, hogy most azonnal vége legyen.
if (IncomingMsgQueue.Count >= length)
{
Read(_readBeginFrameArray, offset, length);
_asyncReadBeginResult.OnCompletion(true, null, length, true);
}
}
catch (Exception)
{
_asyncReadBeginResult.Dispose();
throw;
}
return(_asyncReadBeginResult);
}